The 1988 Trans-Am Series season was the 23rd running of the Sports Car Club of America's premier series. 1988 would mark the end of the "GT era", in which the series had been the support series, and often the lesser classes, of the more popular IMSA GT Championship, which had overtaken Trans Am as the most popular road racing series in the United States beginning in 1973 after the decline of muscle cars and the 1973 Oil Crisis. This led to an increase in competitiveness from foreign manufacturers. In 1989, the series would reformat to only use American branded and American powered vehicles, placing high displacement V8s in any American car entered. This would bring the series back to its "American muscle" roots, and would last until the end of the century, when Italian manufacturer Qvale would win the championship.